整理

include/boost/mpl/aux_/partition_op.hpp

@@ -0,0 +1,58 @@
+
+#ifndef BOOST_MPL_AUX_PARTITION_OP_HPP_INCLUDED
+#define BOOST_MPL_AUX_PARTITION_OP_HPP_INCLUDED
+
+// Copyright Eric Friedman 2003
+// Copyright Aleksey Gurtovoy 2004
+//
+// Distributed under the Boost Software License, Version 1.0. 
+// (See accompanying file LICENSE_1_0.txt or copy at 
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Id$
+// $Date$
+// $Revision$
+
+#include <boost/mpl/apply.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/pair.hpp>
+#include <boost/mpl/aux_/lambda_spec.hpp>
+
+namespace boost { namespace mpl { 
+
+namespace aux {
+
+template< typename Pred, typename In1Op, typename In2Op >
+struct partition_op
+{
+    template< typename State, typename T >
+    struct apply
+    {
+        typedef typename State::first first_;
+        typedef typename State::second second_;
+        typedef typename apply1< Pred,T >::type pred_;
+
+        typedef typename eval_if<
+              pred_
+            , apply2<In1Op,first_,T>
+            , apply2<In2Op,second_,T>
+            >::type result_;
+
+        typedef typename if_<
+              pred_
+            , pair< result_,second_ >
+            , pair< first_,result_ >
+            >::type type;
+    };
+};
+
+} // namespace aux
+
+BOOST_MPL_AUX_PASS_THROUGH_LAMBDA_SPEC(3, aux::partition_op)
+
+}}
+
+#endif // BOOST_MPL_AUX_PARTITION_OP_HPP_INCLUDED